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Mechanical Considerations
7. Mechanical Considerations
7.1. Form Factors
The COM Express specification describes 4 different sized COM Express Modules. The Mini
(55x84 mm), Compact (95x95 mm), Basic (95x125 mm) and the Extended (110x155 mm)
Modules. A Carrier Board can be designed to handle more than one Module size by placing
Carrier Board mounting holes at the appropriate locations for each Module size that will be
supported. For example, a Carrier Board designed for Basic-sized Modules could provide
additionally the one mounting hole, unique for Compact-sized Modules, to allow that size. The
necessary standoffs can then be populated if applicable.
Figure 75: Mechanical comparison of available COM Express Form Factors
106.00
70.00
0.00
0.00
4.00
80.00
151.00
4.00
Extended
91.00
121.00
Basic
91.00
Compact
51.00
Mini
18.00
6.00
16.50
74.20
Common for all Form Factors
Extended only
Basic only
Compact only
Compact and Basic only
Mini only
All dimensions are shown in millimeters.
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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